Editorial Board members have written essays that contextualize the primary source material and highlight key themes, topics, and events discussed within and across the files. Subjects include the role of signals intelligence in key Allied operations during the Second World War; the role and influence of intelligence in shaping British policy; the function of the Joint Intelligence Committee; and British defense policy in the early Cold War.
- Secret Intelligence and British policy, 1909–45 by Gill Bennett, Foreign and Commonwealth Office, London, U.K.
- The Impact of Intelligence on Policy by Anthony Glees, University of Buckingham, U.K.
- The Origins, Wartime Experiences, and Postwar Nature of the Joint Intelligence Committee by Michael Goodman, King's College London, U.K.
- British Defense Policy and the Atomic Bomb at the Dawn of the Cold War, 1945–52 by Matthew Jones, London School of Economics and Political Science, U.K.
- Churchill’s Golden Geese: The Role of Ultra in Allied Strategy and Operations by Denis Smyth, University of Toronto, Canada